Datasheet

+V
S
O.S.
GND
8
3
4
LM75A
C6
100 nF
R1
10k
R3
10k
7
6
5
1
2
A0
A1
A2
SCL
SDA
Optional but
Recommended
Pull-up
In Stand-alone
Mode
SHUTDOWN
BYPASS
+IN
-IN
C2
100 nF
C1
100 nF
R5 200k
R2
10k
R3
10k
R4
10k
C3
6.8 nF
C4
6.8 nF
C5
6.8 nF
GND
Vo2
Vo1
V
DD
LM4861M
+ 5 VDC
O.S.
GND
8
3
4
LM75A
R1
10k
Q1
2N2222A
K1
5V
Relay
Heater
Heater
Supply
D1
1N4001
R2
10k
7
6
5
1
2
A0
A1
A2
SCL
SDA
Optional but
Recommended
Pull-up In
Stand-alone
Mode
C1
100 nF
+V
S
+V
S
O.S.
GND
8
3
4
LM75A
C1
100 nF
+12V
+12V/300 mA
Fan Motor
R1
10k
R2
10k
Q2
NDP410A
series
Q1
2N3904
R3
10k
7
6
5
1
2
A0
A1
A2
SCL
SDA
Optional but
Recommended
Pull-up
In Stand-alone
Mode
LM75A
www.ti.com SNOS808O –JANUARY 2000–REVISED MAY 2013
TYPICAL APPLICATIONS
When using the two-wire interface: program O.S. for active high and connect O.S. directly to Q2's gate.
Figure 12. Simple Fan Controller, Interface Optional
Figure 13. Simple Thermostat, Interface Optional
Figure 14. Temperature Sensor with Loudmouth Alarm (Barking Watchdog)
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